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Earnings per share - Basic earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings per share [abstract]
Profit/(Loss) from operations attributable to equity holders of the Group	$ 9,972	$ 2,039	$ (5,593)
Weighted average number of shares in issue (in shares)	120,599	121,421	120,901
Basic earnings / (loss) per share (in dollars per share)	$ 0.083	$ 0.017	$ (0.046)

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

+ References

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- Definition

The profit (loss) attributable to ordinary equity holders of the parent equity. [Refer: Profit (loss)]

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- Definition

The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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